This uniquely shaped nut is one of my favorites, and is also one of the lower-fat choices when it comes to mixed nuts. The fat that cashews do contain is rich in oleic acid - the heart-healthy monounsaturated fat found in olive oil. Cashews also are a good source of iron and contain copper, essential for the formation of red blood cells, and magnesium, which is vital for healthy bones. One way to get cashews into your diet and boost your energy is with a cashew nut butter sandwich. Start with a slice of fiber-packed wholegrain bread and then top it with cashew butter for a healthy, energy-promoting mix of carbohydrates, protein, and fat.